The ArcGIS Pro interface for composing a printed map is called:

The ArcGIS Pro interface used for composing a printed map is the Layout. This interface allows users to design and arrange elements of a map such as map frames, legends, titles, scale bars, and north arrows for print or export purposes. The Layout view is specifically tailored for cartographic design, enabling users to manipulate the appearance of their maps and create a final product that is ready for presentation or publication.

While the Map View provides an interactive space for working with geographic data and visualizing spatial relationships, it focuses on data analysis rather than the composition of layouts for print. The Scene Viewer is used to create and manage 3D visualizations, which is distinct from the print-oriented functions of the Layout. Finally, a Dashboard is used for creating interactive data visualizations that allow users to monitor and analyze trends and metrics, rather than for composing printed maps.

In summary, the Layout interface offers the necessary tools and features for creating polished, professional maps suitable for printing, distinguishing it as the most appropriate choice for this task.